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Microwave GE SpacemakerXL JVM 1450

How do you replace the magnetron tube. My microwave runs but does not heat up. I suspect that the magnetron tube is gone bad. I have read some forum posts and my microwave has some of the same problems related to the tube. Thanks Andrew Exactly how do you change the magnetron tube?  I have a GE Spacemaker model JVM 1430WD002?  Was there a recall on this?

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  • Microwave Ovens Master
  • 27,151 Answers

If you need to ask how to do this task, you may have no idea of the extremely high voltages that exist under the cover, even when unplugged. I would advise a competent person changes it for you.

Posted on Aug 26, 2017


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Posted on Jan 02, 2017

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SOURCE: ge spacemaker microwave jvm/1650

Mmmm it's so easy,
First disconect the power, take the cover off, moslitly there would be 5 screws and two tab's on the top.
inside on the right hand side the magnetron it's a sylver box measuring about 4 in x 4 in x 5 in. It will have a plasic cover moslitly that would have to be remove first then on the magnetron there is 4 crews and one connector.
It should fall downard after.
If you have a power supply after the secondary , that may also be your problem.



Posted on Jan 22, 2008

  • 93 Answers

SOURCE: how to remove ge spacemaker 1400?

make sure you check the diode first its cheaper and maybe worth the fix if its a magnatron throw microwave away

Posted on Nov 15, 2011

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1 Answer

Micro not heating.

The magnetron is supposed to read nearly zero ohms across the two terminals. You are measuring the resistance of the filiament/heater/cathode of the tube. Activity in the magnetron occurs when the heated electrons are emitted from the cathode, pass through the magnetic field, swirl about, bounce in and out of indentations (vanes) in the tube, and finally land on the plate (antenna). The resistance from the cathode to the plate should be infinite. If not, you probably have a bad tube. Or, if there is continuity between the heater and the case, then you have a shorted tube.

What eventually happens to most vacuum tubes is that the cathode (filiament in this case) becomes coated with a material which inhibits the launching of electrons into the tube. When the flow becomes too low, oscillation ceases, and you have no microwave output. Sometimes they reach the threshold, but do no cross over quickly. Then you have a magnetron that is intermittent for a while.

If you need further help, I’m available over the phone at

May 18, 2016 | KitchenAid KHMS2050SSS Microwave Oven

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Micowave runs but doe not heat.

If it looks and sounds like it's running but doesn't heat, one possibility is that the magnetron tube has burned out. This is the electronic tube that emits the microwave radiation. Another possibility is that the control circuit that regulates turning the magnetron tube on and off for defrosting and lower-than-100-percent heating rates could be faulty. Try heating with the defrost setting and at full power and see if either method results in any heating. The cost of replacing the magnetron at a repair shop could be high enough that you might rather just buy a new microwave oven. My father replaced the magnetron tube himself, but he's an electronic engineer. I wouldn't recommend that just anyone try it. How new/old is it?

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Why is my microwave model 60609 making extremely loud noise and not heat?

Usually that is a sign that your magnetron tube has gone bad (shorted out).

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Jun 10, 2014 | Kenmore 80822 80823 80824 80829 1500...

1 Answer

The microwave turns on but does not heat food. i reset the microwave by unplugging it for 2 minutes. once plugged back in, i reset the clock. i made sure the unit was not in demo mode. it still does not...

A part called the magnetron tube supplies the microwaves which heat your food. It's possible the tube has gone bad. It's also possible that other problems are keeping the proper power from being applied to let the tube work.

Microwave ovens use hazardous voltages WHICH CAN KILL YOU, so troubleshooting is best left to professionals with the tools and experience to work on them safely. If this is a basic counter-top oven, it may be more economical just to replace it. Otherwise let a qualified technician determine what has gone wrong and give an estimate to repair.

Sep 02, 2011 | Microwave Ovens

1 Answer

Microwave running like normal but not heating food?

A part called the magnetron tube makes the microwaves, and either the tube has gone bad or it's not getting power for some reason. If you noticed any strange sounds, sparking or funny smells before the oven quit heating, it's safe to assume the magnetron is bad. But they can also go bad without being obvious about it.

It's also possible that there's something wrong with the control board or connections to it so it's not switching on the magnetron power. In some brands and models, door switches and safety thermostats may cause problems.

If this is a basic counter-top oven, you probably should just replace it. They're so inexpensive now that it will probably be half the cost just to get an estimate. And if it is a bad magnetron, the repair would certainly exceed replacement cost. For a high-end oven or built-in model, it might be worth getting the estimate and then deciding whether to fix or replace.

Hope this helps! Thanks for using Fixya.

Apr 03, 2010 | Microwave Ovens

1 Answer


The Magnetron tube is what generates the microwaves that causes the heating.

If it runs but there is no heating then either the tube is bad, the overheat safety is bad, or the controller is bad. The tube and controller are both expensive and I suggest purchasing a new microwave instead of trying to repair it if the microwave is older. If the controller seems to be working for everything else then the tube is probably the culprit. You can take the unit apart (unplug it first!) and remove the magnetron tube and take it to a parts store for replacement. First check the safety (if your unit as one) and make sure it is closed (you'll need to ohm it out with a ohmmeter).

The tube usually goes bad when the oven is run without anything in it or there is a lot of reflective items in the microwave (i.e. metal, foil, etc) . What happens is the microwaves bounce around inside the cooking cabinet and never get absorbed by anything. So they end up bouncing back to the magnetron and heating it. The magnetron has metal in it. The tube then overheats and fails. The better microwaves will have a safety that shuts the magnetron down if it overheats.

If this helps you, please select YES to the first two ratings questions. Thank you, and Good Luck.

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either the h.v. diode,h.v. capacitor or the magnetron tube are suspect here due to the no heat condition you have

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it could be a defective thermal fuse,h.v. cap,h.v. diode or the magnetron tube are defective

Oct 02, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

I have a GE microwave, model JVM 3670 BF03. It is an above the range unit. The unit still has power, the clock, turnstyle and fan work fine, but it no longer heats food.

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Aug 18, 2009 | Microwave Ovens

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